Logix5000 Controllers General Instructions - SLAC Confluence

Function Block Attributes 649Function Block Responsesto Overflow ConditionsIn general, the function block instructions that maintain history do notupdate history with ±NAN, or ±INF values when an overflow occurs.Each instruction has one of these responses to an overflow condition:Response 1:Blocks execute their algorithm and checkthe result for ±NAN or ±INF. If ±NAN or±INF, the block outputs ±NAN or ±INF.ALMNTCHResponse 2:Blocks with output limiting execute theiralgorithm and check the result for ±NAN or±INF. The output limits are defined by theHighLimit and LowLimit input parameters.If ±INF, the block outputs a limited result.If ±NAN, the output limits are not used andthe block outputs ±NAN.HLLResponse 3:The overflow condition does not apply. Theseinstructions typically have a boolean output.BANDOSRIDEDTPMULINTGBNOTRESDDERVPOSPPIBORRTORESELRLIMPIDEBXORSETDFGENRMPSSCLCUTDTOFRHPFSCRVSOCD2SDTONRLDL2SELD3SDLDLGSNEGDFFLPFSRTPJKFFMAVESSUMOSFIMAXCTOTMINCUPDNMSTDMUXPublication 1756-RM003I-EN-P - January 2007